I personally wouldn't use any of that crap in my engine. Go here and read:

www.auto-rx.com

Then go to www.bobistheoilguy.com and read all the testemonials on how well this stuff works. They even have discussions on the more caustic (Berryman's, Gunk, MMO) engine cleaners.

T-red E0 SVT ATS 17x7.5 Comp Lites, 215/45/17 Falken 512s, Ausi Bar, Boxed subframe, Poli all around, Warmonger's Opt Y, Opt TB, AFE, DMD, NGK's, Bendix Ti, Alpine, Polk, Mobil-1 0W-40, Redline MTL.